Yoshihiro Aoko (Blue Steel) Petty Japanese Utility Chef Knife 5.3 IN (135mm) Grade: Ao Warikomi / Knife Type: Petty (Utility) Knife Steel Type: Aoko (Blue Steel #2) Warikomi Blade: Double-Edged (50/50) / Blade Length: 5.3 IN (135mm) BOLSTER: Stain Resistance Steel / Handle Material: Western Style Black Pakkawood Hardness Rockwell C scale: 62-63 / Saya Cover : Included